Yesterday i deleted my old logo on my site and replaced it with new artwork. The artwork remain until this morning - I logged on this morning and the artwork i had previously was back.

Just press "Reload." The old artwork is most likely cached in your browser. Pressing "Reload" forces the browser to recheck the cache.

We are having issues also, images will not load, our main site logo dissapeared for everyone in the guild after it had been up for many days. I tried to fill in with a new one but it remains blank with just a background image and no logo. Yes I did mantually reload a few time already over a few days, it remains broken.